Using ForEach inside a Picker - swiftui

Question

I'm having issues pulling data from an Array into a picker using SwiftUI. I can correctly make a list of the data I'm interested in, but can't seem to make the same logic work to pull the data into a picker. I've coded it a few different ways but the current way I have gives this error:
Referencing initializer 'init(_:content:)' on 'ForEach' requires that 'Text' conform to 'TableRowContent'
The code is below:
import SwiftUI
struct BumpSelector: View {
#ObservedObject var model = ViewModel()
#State var selectedStyle = 0
init(){
model.getData2()}
var body: some View {
VStack{
List (model.list) { item in
Text(item.style)}
Picker("Style", selection: $selectedStyle, content: {
ForEach(0..<model.list.count, content: { index in
Text(index.style)
})
})
}
}
The model is here:
import Foundation
struct Bumps: Identifiable{
var id: String
var style: String
}
and the ViewModel is here:
import Foundation
import Firebase
import FirebaseFirestore
class ViewModel: ObservableObject {
#Published var list = [Bumps]()
#Published var styleArray = [String]()
func getData2() {
let db = Firestore.firestore()
db.collection("bumpStop").getDocuments { bumpSnapshot, error in
//Check for errors first:
if error == nil {
//Below ensures bumpSnapshot isn't nil
if let bumpSnapshot = bumpSnapshot {
DispatchQueue.main.async {
self.list = bumpSnapshot.documents.map{ bump in
return Bumps(id: bump.documentID,
style: bump["style"] as? String ?? "")
}
}
}
}
else {
//Take care of the error
}
}
}
}

Answer 1

index in your ForEach is just an Int, there is no style associated with an Int. You could try this approach to make the Picker work with its ForEach:
struct BumpSelector: View {
#ObservedObject var model = ViewModel()
#State var selectedStyle = 0
init(){
model.getData2()
}
var body: some View {
VStack{
List (model.list) { item in
Text(item.style)}
Picker("Style", selection: $selectedStyle) {
ForEach(model.list.indices, id: \.self) { index in
Text(model.list[index].style).tag(index)
}
}
}
}
}
EDIT-1:
Text(model.list[selectedStyle].style) will give you the required style of the selectedStyle.
However, as always when using index, you need to ensure it is valid at the time of use.
That is, use if selectedStyle < model.list.count { Text(model.list[selectedStyle].style) }.
You could also use this alternative approach that does not use index:
struct Bumps: Identifiable, Hashable { // <-- here
var id: String
var style: String
}
struct BumpSelector: View {
#ObservedObject var model = ViewModel()
#State var selectedBumps = Bumps(id: "", style: "") // <-- here
init(){
model.getData2()
}
var body: some View {
VStack{
List (model.list) { item in
Text(item.style)
}
Picker("Style", selection: $selectedBumps) {
ForEach(model.list) { bumps in
Text(bumps.style).tag(bumps) // <-- here
}
}
}
.onAppear {
if let first = model.list.first {
selectedBumps = first
}
}
}
}
Then use selectedBumps, just like any Bumps, such as selectedBumps.style